The Biochemical Degradation Characteristics Of Nitrobenzene Pollution In Weihe

Weihe River is the largest tributary of the Yellow River, is also the largest river inShaanxi Province. Weihe River pollution load aggravation and water quality deteriorationwas caused by the emission of a large number of industrial wastewater and domestic sewagewhich restrict the social and economic development of the Guanzhong region. Therefore,the community pays attention to improve the Weihe River water environment. Among them,the study of the biological degradation characteristics of the Weihe River organic pollutantshas also become of great concern to scientists. In this paper, take Weihe naturalmicroorganisms as object of study, take the organic pollutants nitrobenzene as the typicalpollutants, and apply the anaerobic degradation method to study the microorganismdegradation characteristics of nitrobenzene pollution in the Weihe River.This paper investigated the zinc powder and the natural microorganisms effect ondegradation result independent and of and the two synergies effect on degradation result ofnitrobenzene in Weihe River, and the effects of degradation efficiency on the initialconcentration of nitrobenzene, zinc powder and dosage, pH value, the amount ofmixed microbial strains and so on. This research has conclusions as following:1.The nitrobenzene degradation by zinc alone: under the conditions of the initialconcentration of nitrobenzene is1.2873mg/L, the zinc concentration is1.0mg/L, pH value is6,the temperature is37°C, the reaction time is above120h, the degradation rate ofnitrobenzene is22.44%;2.The nitrobenzene degradation by microorganisms alone: under the conditions of theinitial concentration of nitrobenzene is1.3029mg/L, the volume of anaerobic bacteriamicrobial suspension is250ml, pH value is6, the temperature is37C, the reaction time is50h,the degradation rate of nitrobenzene is95.3%;3. The mixed bacteria of Zinc-Microorganism synergistic degradation of nitrobenzene:under the conditions of the initial concentration of nitrobenzene is1.2532mg/L, the zincconcentration is1.0mg/L, the volume of anaerobic bacteria microbial suspension is250ml,pH value is6,the temperature is37°C, the reaction time is20h, the degradation rate ofnitrobenzene is98.86%.The above experiment showed that the results of the zinc powder and anaerobicmicroorganisms degrade the nitrobenzene together is more desirable, the time of reaction isshorter, the removal efficiency is higher.